Compound Interest Calculator
See the power of compound interest and watch your investment grow over time.
Investment Details
$10,000
$500
8%
20 years
Future Value
$343,778
after 20 years
Total Contributed$130,000
Total Interest Earned$213,778
Growth Multiple2.6x
Interest vs Contributions
Contributed 38%Interest 62%
Year-by-Year Growth
| Year | Total Contributed | Interest Earned | Balance |
|---|---|---|---|
| 1 | $16,000 | $69,530 | $85,530 |
| 20 | $130,000 | $3,453,391 | $3,583,391 |
The Power of Compound Interest
Albert Einstein reportedly called compound interest "the eighth wonder of the world." When your returns earn their own returns, growth accelerates dramatically over time — especially in the final years.
Starting early is the most powerful factor. Investing $500/month from age 25 vs 35 at 8% return results in nearly double the retirement balance at 65 — just 10 extra years of compounding makes an enormous difference.